Human Insulin


Human insulin is a hormone produced in the pancreas. Its main function is to lower blood glucose levels after meals by enabling cells to absorb glucose from the bloodstream. Insulin also promotes the growth and storage of fat and protein.

Insulin is produced by beta cells in the pancreas. The pancreas is an organ located near the stomach that secretes digestive enzymes (which break down food) and hormones, including insulin. Insulin is essential for life as it enables cells to absorb glucose from the bloodstream and convert it into energy.

In non-diabetics, insulin stimulates receptors on muscle, fat, and liver cells, which causes them to take up glucose from the blood. The body then converts this sugar (glucose) into glycogen (a type of starch). Glycogen is stored in muscle cells as a form of backup energy should blood sugar levels fall too low. Glucose may also be converted into fat for long-term storage if excess sugar in the body cannot be used immediately by other organs or muscles.


There are two basic types of insulin in common use− rapid-acting and long-acting.

  • Rapid-acting insulin starts to work more quickly than long-acting insulin, but its effects wear off sooner. It's generally used to cover meals and snacks, with long-acting insulin given once or twice daily for the rest of the coverage. Rapid-acting insulin can be in the form of an injection, a pump, or a patch that is worn on the body.

  • Long-acting insulin is also available as an injection or pump, though it's also available as a basal solution that is infused under the skin daily using a pump to administer it. This basal solution lasts longer than rapid-acting insulin and is meant to provide coverage throughout the day and night, so you only have to remember to give yourself one shot instead of multiple shots or pokes per day.

  • Regular insulin is the most common form of human insulin. This is the kind that you will probably receive if your doctor prescribes your insulin. It's synthetic, short-acting insulin that comes in a bottle (vial) and can be stored unrefrigerated for up to a month at room temperature. The vials are usually prefilled, with 0.5 ml of insulin per 1 unit or 10 ml per 100 units. You can mix it with any of the types of syringes available on the market today, but it's recommended that you use disposable syringes for this purpose as it saves you time and money in the long run.


NPH stands for Neutral Protamine Hagedorn, but as much as it sounds like the name of a superhero or a healthy breakfast, it's actually one type of human insulin. It comes in vials, which you can draw up using syringes. The vials are made from brown glass and are smaller than U-100 insulin vials. NPH is the brand name for this type of insulin, but the generic is called isophane insulin.

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The big difference between NPH and other types of human insulin is how long it lasts in your body. This kind lasts longer than regular human insulin and longer than most animal insulins. That means if you take NPH at 10 am, you can eat some carbs at noon and still have enough insulin in your system to cover them.

Another difference between NPH and other human insulins is that most people don't use it right before bedtime. Again, that's because when you take it at night, it can last out into the next day−which isn't what you want if your goal is to keep your blood glucose steady throughout the day.

Humulin Definition

Humulin is a specific type of insulin derived from pigs and used to treat diabetes. Insulin, which is a hormone produced in the pancreas, regulates blood glucose levels by telling the body's cells to take up glucose from the bloodstream. The body cannot produce enough insulin, so it must be injected. In type 1 diabetes, the immune system attacks the pancreas and destroys its beta cells, which are responsible for producing insulin. Patients with type 1 diabetes must inject themselves with Humulin every day.

Humulin can be made from different types of pig pancreases, and patients should consult their healthcare provider about which one is best for them.

Human Insulin Production

Human insulin can be synthesized using recombinant DNA. A researcher has developed a method for inserting a human gene into the DNA of a normal bacterium. "Recombinant" microorganisms can now deliver the insulin-producing protein encoded by the human gene.

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In the lab, scientists can create insulin that is identical to human insulin. Once the plasmid has been removed, the human insulin quality is added to it, and the result is called a plasmid.

When the "recombinant" microorganisms are grown in large fermentation tanks, the recombinant bacterial organisms use the gene to begin producing human insulin. After being returned to the microscopic organisms, the scientists return the plasmid.

Insulin chains A and B were artificially inserted into two PBR322 plasmid vectors for the synthesis of human insulin by Hakura et al. (1977).

To be used as a host in E. coli, these genes must be inserted alongside the plasmid's β-galactoside gene.

The cyanogen bromide treatment of β-galactosidase resulted in the isolation of insulin chains A and B. Methionine codon structures were added to the N-terminus of every quality for both A and B-chains of ace insulin chains, allowing for the possibility of a single unit.

Sulfonation using sodium disulfonate and sodium sulfite synthesizes human insulin in vitro after separating components A and B.


In conclusion, human insulin is a protein that is essential for the regulation of blood sugar levels in the body. Without insulin, blood sugar levels would become dangerously high, leading to potentially life-threatening complications. While there are other forms of insulin available, human insulin is the most effective and is the preferred treatment for most people with diabetes.


1. What is human insulin?

Human insulin is a hormone that is naturally produced by the pancreas. It works by lowering blood sugar levels and controlling diabetes. Human insulin is made in a lab using genetic engineering technology to replicate the natural human hormone.

2. How does human insulin work?

Human insulin lowers blood sugar levels by allowing glucose to enter the body's cells. When the blood glucose level rises above normal, an enzyme called glucokinase converts glucose into a storage form called glycogen in the liver and muscle tissue. Human insulin helps prevent the liver from producing more glycogen than needed so that more glucose can be used for energy instead of being stored as glycogen. This also stops your body from storing fat as well as it would otherwise be able to do if you did not take insulin shots every day.

3. How does the dose of human insulin differ from that of insulin pens?

The dose of human insulin and insulin pens is similar, but there are some differences between how you take them. Insulin pens are typically taken once or twice daily (before meals), whereas human insulin may be taken up to three times a day (before meals). In addition, the amount of blood sugar lowering effect varies between these two types of medication− one unit of human insulin has about half as much lowering effect as an insulin pen or vial injection. If you take more than one unit per injection, it will have less effect than if you had taken it all at once in a single shot.

4. What is the difference between human and animal insulins?

Human insulin is made from genetically altered bacteria that are grown in large vats. Animal insulins are made by extracting them from the pancreases of pigs or cows. Human insulin has been shown to be more effective than animal insulins in treating diabetes, but it may cause more side effects, such as allergic reactions and weight gain in some people.


Simply Easy Learning

Updated on: 13-Oct-2022


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